Impeller



M. J. NUSIM. I MPELLER. APPLICATION flLED MAR. 31,1921.

Patented Dec. 5, 1922.

7' I I INVENTOR Mia 072 LZQI/zbim $42M L 2; A

V Patented Dee. 5,1922. l

so sures rairsur OFFICE.

Tmnnacn J. mism, or mis'ro w, PENNSYLVANIA, ASSIGNOR To INGEasotL-iuinncomramnor JERSEY CITY, new JERSEY, a CORPORATIONOF NEW JERSEY.

IMPELLER.

Application filed March 31, 192i. Serial No. 4517,2413,

To aZZ whom it may concern:

Be it known that I, MELAGH J. NUsIM, a citizen of the United States, aresident of Easton, county of Northampton, and State of Pennsylvania,have invented a certain-Impeller, of which the following is aspecification, accompanied by drawings.

This invention relates to impellers for single or double flowcentrifugal blowers, compressors and the like, but more particularly toimpellers of the open type, adapted for axial intake and radialdischarge, althou h my construction may be found applica le to impellersof the closed type.

The web of an impeller of the type to which this inventionrelates, isprovided with blades having entrance edges suitable for receiving theair or other gas beinghandled, from an axial approach, impartingvelocity to the airor gas, and then discharging it radially at theperipheries or exitedges of the blades;

Heretofore the hub, web and blades of an impeller of the type referredto have been built up in a number of separatesections, or pieces and theblades themselves have usually been formed in sections, for instance, bymaking the intake portions of the blades separate from the dischargeportions.

' T have found that the impeller may be simplified and at the same timestrengthened constructing theentire impeller in one piece, that is, bymaking all parts, including i the hub, the web and the blades out of onepiece of metal.

I have devised a method for making the entire impeller, whether single"or double flow, outof one piece of metal, which in cludes certainmilling and bending operations, to be described, in order to constructthe blades in one piece, with the hub and web, but am not to beunderstood as limiting the invention to any particular method, as othermethods may be devised by those skilled in the art for producing asimilar I structure having the advantages of my improved impeller.

()ne preferred form of impeller is shown the accompanying drawings, inwhich- Figure 1 isa side elevation partly broken away of an impeller,with the shaft in transverse section, and a portion of the blades ill--dicated to illustrate their shape.

Figure 2v is a transverse sectional elevation of the impeller on theline 2-2 of Figcharge.

ure 1 looking in the direction of the arrows.

Figure 3 is a top plan view of Figure '1,

and

Figure 4 is a detail top plan view of one blade, and a portion of thehub and web of the impeller illustrating the shape .of the blades beforeand after bending the intake portions. i Referring to the drawings, theimpeller is mounted on a suitable shaft A, and rotates within agcasingB, only a portion of which is shown. The impeller comprises a thickenedhub portion C, a thinner circular web D, and blades E, carried by thehub and web and adapted for axial intake and radial dis- I The circularweb 1) extends as usual, in a plane transversely to the longitudinalaxis of the hub and preferably tapers graduall from the hub portion tothe periphery of the web, the hub and Web preferably merging in agradual curve as indicated particularly in Figure 2.

. As indicated in accordance with my in vention, the hub, web-andbladesconstitute blades preferably terminate substantially at. the peripheryF'of the web at which the v exit edges J of the blades are located.

In constructing the impeller the blades may be milled out of the solidmetal as' indieatedin full lines in Figure 4, so that the intakeportions G project beyond the hub portion C in an axial direction. Theseintake portions Gare then bent after milling by the applicationv oflocalized heat until they assume substantially the positions indicatedin dotted lines in Figure 4c, in which they extend in a directiontransverse to the axis of the shaft or the axis of the impeller, andserve to draw imthe air from an axial approach. I

The blades are supported upon and carried by both the hub and web, sincethey are integral with both of said portions of the impeller, and astiff and strong impeller is produced having blades which present,

smooth unbroken driving faces to the air,

increase the economy and efliciency of the im eller.

claim: r I

1. An impeller for centrifugal blowers, compressors and the like,adapted for axial intake and radial discharge, and comprising athickened hub portion having a thinner circular web extendingtransversely to the longitudinal axis of the hub, said Web taperinggradually from the hub portion to the periphery of the web, and bladesextending from the base of the said thickened hub portion alon the sidesof the hub and Web to the perip ery of the web and provided with innerintake portions lying in part directly upon the thickened hub portionand bent transversely to the longitudinal axis of the hub and projectingbeyond the hub portion in an axial direction, the outer portions of theblades extending radially, and the exit edges terminating substantiallyat the periphe of the said web, the said hub, web, and blades all beingformed in one piece.

2. An impeller for centrifugal blowers, compressors and the like,adapted for axial 1 Menace intake and radial discharge, and comprising athickened hub portion having a thinner circular web extendingtransversely to the longitudinal axis of the hub, said webtapering-gradually from the hub portion to the periphery of the web, andblades extending from the base of the said thickened hub portion alonthe sides of the hub and web to the periphery ofthe web, and providedwith sharply defined inner intake portions lying in part directly uponthe thickened hub portion and bent transversely to the longitudinal axisof the hub and projecting beyond the hub portion in an axial direction,the outer portions of the blades extending radially and being unbent,and the exit edges terminatin substantially at the periphery of the saidweb, the said hub, web, and blades all being formed in one piece and theouter ends of said integral web and blades presenting a smooth andunobstructed driving face.

In testimony whereof I have signed this specification.

MELACH J. NUSIM.

